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c 2 a 2 + b 2 - 2ab cos c
cos a b 2 + c 2
cos 2 a - cos 2 b
cos a 2+b 2-c 2
cos 2a + cos 2 b
cos 2a+2b
cos a+b cos a-b cos 2b-sin 2a
cos a+b cos a-b cos 2a-sin 2b
a2+b2+2ab cos
cos 2 a-b
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